Grinding-mill



- (No Model.)

. 2 Sheets-Shet 1. G. & A; RAYMOND."

GRINDING MILL.

No. 354,228. Patented Dec. 14, 1886.

i q l 2 Sheets-Sheet 2,

(No Model.) Y I G. & A. RAYMOND.

GRINDING MILL.

No. 354,228. PatentedfDeoLM, 1886.

N, PETERS, Phnla-LRMHP P. Walbinginn. 0.0

UNITED STATES PATENT OFFICE.

GEORGE RAYMOND AND ALBERT RAYMOND, OF CHICAGO, ILLINOIS.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 354,228, dated December14, 1886.

Application filed January 11, 1886. Serial No. 188,250. No model.)

To all whom it may concern:

Be it known that we, GEORGE RAYMOND and ALBERT RAYMOND, citizens of theUnited States, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements inGrinding-Mills, of which the following is a specification.

Our invention consists in certain combinations of parts and features ofconstruction hereinafter fully described, and pointed out in the claims.

In the drawings hereto annexed, and which form a part of thisspecification, Figure 1 is a plan view of our machine looked atfromabove. Fig. 2 is a vertical cross-section of the same on the line 2 2,Fig. 1. Fig. 3 is a vertical cross-section of the stones, hopper, andadjoining parts on the line 3 3, Fig. 1; and Fig. 4, a detail of thestep of the shaft. A

We have shown our improvements as applied to a sweep-mill in thisinstance, but they are clearly applicable, in many respects, to mills ofother constructions. V

In the drawings, the sweep 1 is bolted to a master-wheel, 4, the latterbeing centrally pivoted upon the shaft 5, and giving motion to thepinion 6, cast in one piece with the gearwheel 7, and rotating on theshaft 8, fixed in casting 9, attached to the bedtimbers 10 of the frame.The master-wheel has a projecting flange, 11, near its bottom, whichengages with grooves cut in rotating pulleys 12 13 14 15, mounted onshafts fixed to the frame. These pulleys serve to steady themaster-wheel vertically, and to partially support its weight.

Motion is communicated from the gear-wheel 7 to pinion 16, formed in onepiece with gearwheel17, which in turn communicates motion to pinion 18,mounted on the central shaft, 5. The hub of pinion 18 rests upon aprojection from casting 9, in which the shaft 5 is set, and has at itslower side abeveled pinion engaging with a second beveled pinion onshaft 19, said shaft 19 being provided for the purpose of taking offsurplus power from the mill to be used for driving other mills, or otherpurposes, and also to enable the mill to be driven by other thanhorsepower-as, for instance, by a steam-engine. The hub of pinion 18 hasalso an upward projection or sleeve, 20, which fit into box 27 said boxbeing circular in form.

The ring 28 has a circular flange, 29, projecting upward at right angleswith its plane, the circular opening within said flange being spanned bya narrow diametrical bridge, 30, said bridge being curved and having itsconvez': side uppermost. The box 27 is provided with twodiametrically-opposite flanges, 31 and 32, to one of which, 31, ispivoted a bar.

32, carrying the hopper 33, rigidly attached to it.

The lower part of the hopper is circular in shape, and of such a size asto be received within the upwardly-projecting flange 29. To the flange32 of the grindingchamber is pivoted at 34 a rod, 35, the upper end ofwhich is screw-threaded, and carries a hand-nut, 36, by means of whichthe free end of the bar 32 may be secured in position, said free end ofthe bar being provided with a slot, 37, for receiving the rod 35.Projecting from the under side of the bar 32 is a knob, 38, which bearsupon the bridge 30, with the pressure determined by the position of theend screw, 36.

It should be observed that the casting 26 has at its upper and lowerends two points of close bearing upon the shaft 23. The ring 28 isprovided with springs 39, resting upon the upper edge of the box 27, andserving to keep the two millstones out of contact with each other whenthe mill is running empty.

The step 40, upon which the lower end of shaft 23 rests, is bolted tothe mastenwheel, and is shown in detail in Fig. 4.

The mounting of the upper millstone and of the hopper which we haveshown is not costly to make, is extremely simple, and is thoroughlyefficient in operation. The plate to which the upper stone is attached,having a central bearing only, can oscillate vertically IOU when anyforeign substance comes between the faces of the stones enough toprevent injury to the grindingsurfaces.

We claim- 1. In a grinding-mill, the combination of a master-wheel, acasting bolted thereto on one side of its center, a millstone supportedon said casting, a shaft journalcd in the said casting and geared to bedriven by the master- Wheel, a second millstone carried by the saidshaft, and a central fixed shaft for the master- Whee], substantially asand for the purpose set forth.

2. In a grinding-mill, the combination of a master-wheel, with a castingmade fast thereto, a millstone adjustably mounted upon said casting, ashaft and a second millstone mounted thereon, and a step fixed to themaster-wheel and supporting the shaft, substantially as and for thepurpose set forth.

ing the pressure of said point upon said bridge, 30

and thereby the grinding of the mill, substantially as described.

GEORGE RAYMOND. ALBERT RAYMOND.

\Vitnesses:

FREDERICK O. GooDWIN, E. L. HUBER.

